Synonyms and related words :
certain, definite, destined, determined, fated, fateful, fixed, indefeasible, ineluctable, ineludible, inescapable, inevasible, inevitable, inexorable, inflexible, irresistible, irrevocable, necessary, predestined, predetermined, relentless, resistless, settled, sure, sure as death, sure as fate, unalterable, unchangeable, uncontrollable, undeflectable, unevadable, unpreventable, unstoppable, unyielding